What does the 'chmod' command do?

The 'chmod' command is used to change the file permissions in a Linux system. Permissions dictate which users or groups can read, write, or execute a file. By using 'chmod', you can specify different levels of access for the owner of the file, the group associated with the file, and other users.

The command allows for various modes of changes through symbolic or octal notation, enabling administrators and users to fine-tune access to files based on their needs. This level of control is crucial for maintaining security and ensuring that only authorized users can perform specific actions on files.

Understanding how to use 'chmod' is foundational in managing file permissions effectively, making it a vital command for users working in a Unix-like environment.